WORK SAFE BC – Occupational Health and Safety Regulation Section 20.112 Hazardous materials
“Before work begins on the demolition or salvage of machinery, equipment, buildings or structures, the employer or owner must ...”
http://www2.worksafebc.com/publications/OHSRegulation/Part20.asp#SectionNumber:20.112
WORK SAFE BC – Occupational Health and Safety Regulation Section 6.1 Asbestos
“The employer must ensure that an inventory of all asbestos-containing materials present in the workplace is prepared and kept current. ... “

CBC DIGITAL ARCHIVES Asbestos: Magic Mineral or Deadly Dust? Topic spans: 1942 - 2002
“The needle-like fibres seemed like nature's perfect gift. Fireproof, indestructible and cheap, from the 1940s to the 1970s, asbestos was everywhere. It was woven into clothes, used to insulate buildings and even mixed with water as children's play dough. That was before studies linked asbestos dust with cancer and lung disease. Authorities now say asbestos, when handled properly, poses little risk. But nagging concerns, highlighted by the plight of the asbestos miners, have resulted in a shrivelling industry. “
http://archives.cbc.ca/health/public_health/topics/608/